It can be used for 2 months. But the filter life will vary based on your water conditions. Therefore, it is recommended you change your filter every 2 months or sooner when you notice a change in taste, odor, or flow of the water being filtered for optimal performance.

Yes. It is highly recommended you flush the filter before using. Water filters are made from advanced coconut activated carbon, so there are some carbon fines in the filter. You need to flush firstly to remove those carbon fines to get clean water.